Controlled Atmosphere Cold Storage

Controlled Atmosphere Cold Storage

Air-conditioned cold storage is an upgraded version of the fresh-keeping cold storage, on the basis of the cold storage, add a set of air-conditioned equipment and sealing measures, so as to control the temperature and humidity, oxygen, carbon dioxide and other gases in the library, better fresh-keeping fruits and vegetables and food, in this environment, can inhibit the respiration of fruits and vegetables, extend the storage period, improve the shelf life, than the ordinary fresh-keeping cold storage fresh-keeping time longer, better fresh-keeping effect.

First, the application range of air conditioning cold storage

Air-conditioned cold storage is more suitable for fruits and vegetables anti-season preservation, by adjusting the oxygen, carbon dioxide and other gas components in the air, can delay the respiration of fruits and vegetables, slow down the loss of quality and nutrition, thereby extending its freshness and shelf life, because fruits and vegetables long-term low oxygen and high carbon dioxide effect, The fruits and vegetables still have a long period of "lag effect" or dormancy period after the release of the air regulation state;

This method not only maintains the natural taste and color of fruits and vegetables, well maintains the original shape, color, fragrance of fruits and vegetables, but also improves the added value of products, such as the preservation of morels, matsutake and other expensive products, suitable for long-distance transportation and export. The quality of fruits and vegetables has been significantly improved, creating conditions for export and distribution, and many fruits and vegetables can reach the annual supply of seasonal production and sales, creating good social and economic benefits.

Second, the advantages of air conditioning cold storage construction

The temperature of air-conditioned cold storage is usually designed above 0℃, which means that fruits and vegetables, food, etc., will not freeze, which can greatly maintain the nutrition and freshness of food. Air-conditioned fresh storage adopts inert gas to isolate the air, which can effectively inhibit the respiration and maturation of food cells, and effectively inhibit the generation and function of C2H4 and other ripening ingredients. Moreover, it has the function of reducing oxygen, regulating carbon, inhibiting bacteria, and eliminating toxic side effects of pesticides. Many enterprises that want to do anti-season sales will choose to build air-regulated cold storage and use it with ordinary fresh-keeping cold storage.

Third, air conditioning cold storage construction system

1, air conditioning cold storage includes

(Polyurethane insulation board, chiller, compression refrigeration unit, storage seal, nitrogen system, carbon dioxide removal system, deoxidizer, ethylene removal system, temperature, humidity and gas composition automatic detection and control system)

2. Nitrogen production system

The nitrogen machine has generally experienced the development process of catalytic combustion nitrogen production → carbon molecular sieve adsorption nitrogen production, hollow fiber membrane separation nitrogen production, and vacuum low-pressure adsorption deoxygenation nitrogen production (VSA). Carbon molecular sieve, hollow fiber membrane separation and VSA nitrogen production are widely used.

3, carbon dioxide removal system

It is mainly used to control the carbon dioxide content in the air conditioner. Completely rely on the carbon dioxide released when fruits and vegetables breathe, increase the concentration of carbon dioxide in the air conditioner, and the right amount of carbon dioxide has a protective effect on fruits and vegetables, so that the storage and fresh-keeping effect is good. However, the concentration of carbon dioxide is too high, it will cause harm to fruits and vegetables, so remove (wash) excessive carbon dioxide, regulate and control the concentration of carbon dioxide, to improve the storage quality of fruits and vegetables is very important;

4. There are generally four types of carbon dioxide removal devices

(1) slaked lime removal device;

(2) Water cleaning device;

(3) activated carbon removal device;

(4) silicone rubber film cleaning device. Activated carbon removal device is the use of activated carbon strong adsorption force, the adsorption of carbon dioxide, until the adsorption saturation of fresh air, so that activated carbon desorption, restore adsorption performance, is the current air conditioning warehouse to remove carbon dioxide commonly used devices. The carbon dioxide removal system should determine the working capacity of the removal machine according to the breathing intensity of the stored fruits and vegetables, the volume of the free space of the gas in the gas conditioner, the storage amount of the gas conditioner, and the concentration of the carbon dioxide gas components required to be achieved in the storage.

The cost of air-conditioned cold storage

The cost of air-conditioned cold storage is relatively high, 100 square meters need about 170,000 cost, 500 square meters need about 700,000 cost, the cost of air-conditioned cold storage is affected by a number of factors, including the size of the cold storage, type, division design, equipment and material selection, temperature requirements, regional factors and construction and maintenance costs, etc. These will directly affect the construction cost of the overall cold storage, so before calculating the cost of the air-conditioned cold storage, Leng Di engineers need to specify the construction needs in detail, so as to arrange technical personnel to design the scheme, and then carry out accurate calculation of the air-conditioned cold storage price.